Pressure Pot-Priming the spray gun

[wptski]

I think its good to try to understand how tools work, even have a basic understanding of the engineering intent.

Trying to predict, define or describe performance based on specs is a bit of shell game, which if taken too far can turn into paralysis by analysis.

Its best to keep it simple and practical. Experiment and find what works for you and the work you do.

I have seen a lot of the work that Tom B and Tim R do and it is always very high level. I don't think I could achieve the same results with their products and processes sometimes, but I usually feel like I could with my own. And in the meantime, it is fun to learn from each other. Thats the spirit of the forum.

My background of 35+ years in maintenance working on sometimes very advanced machinery and I found it very difficult to repair without first figuring out how it worked.  Sometimes this spills over into my retired life! [scared]

 

[Scott B.]

I think its good to try to understand how tools work, even have a basic understanding of the engineering intent.

Trying to predict, define or describe performance based on specs is a bit of shell game, which if taken too far can turn into paralysis by analysis.

Its best to keep it simple and practical. Experiment and find what works for you and the work you do.

I have seen a lot of the work that Tom B and Tim R do and it is always very high level. I don't think I could achieve the same results with their products and processes sometimes, but I usually feel like I could with my own. And in the meantime, it is fun to learn from each other. Thats the spirit of the forum.

My background of 35+ years in maintenance working on sometimes very advanced machinery and I found it very difficult to repair without first figuring out how it worked.  Sometimes this spills over into my retired life! [scared]

Have fun with it, keep it simple!  [scared]

 

[tjbnwi]

The question that started the discussion is will the compressor turn on---my answer was yes. Next question was will it the compressor come on while spraying---my answer was about every 4 minutes.

Boyle's Law you posted proves this out. You are missing one key thing about this entire topic and the equipment. This will occur in some way across some variable of time depending on the tank volume of the compressor on every compressor I have seen, serviced and know of. Someday you'll have that epiphany, followed by a forehead slap.

As you can see, I made sure the air hose was connected while the compressor was filling. By connecting the hose from the start it added a slight additional volume to the compressor and did not take away from the volume if I connected it after the compressor had shut off. I made sure the fluid hose valve was closed to not affect/increase the volume of the tank.

You will see the fluid line being purged, and the volume of fluid (in this case water, about 1 US gallon) that was displaced from the tank before the compressor turned back on. The gun is a T-70 with an 0.8mm nozzle/needle set and air cap, this is the smallest set available for the gun. I had finished spraying a piece earlier so the gun is set where it was when I sprayed the piece.

Again, I don't edit my videos you see this in real time as it happened.

My Jc10 is set 125 psi off (factory is 115 I believe)--95 psi on.

If the pot was full of fluid the compressor would not have turned on initially, but soon after beginning spraying.

Tom

Thanks for extra time spent to clean your spray gun and that RolAir is sure quiet too!

The Jc10 is very quiet, that's one of the reasons I bought it.

Tom

 

[wptski]

Please note my comments were not addressing your Graco/Fuji set up but the Fuji Pressure pot set up using the turbine.
Other than in name, one is not the same as the other.

Can't judge the Fuji pressure pot because I haven't used it yet.

Please do and let us know what you think of it.
I would be interested in how well it works getting paint from the pot to the gun in a reasonable pattern.
Tim

I made some other parts to be used in the future with this Fuji 2 qt. pressure pot.  I used a 3M mini-regulator feed from a 5 gallon portable tank with gun's connection capped, I'm "just" looking for material leaks to the gun.

Low and behold the 2 qt. tank itself is leaking at its seal!  This looks exactly like a C.A.T. 2-qt. pressure pot other than its fittings.  I flipped the seal over but that didn't help.  Something else to look into now!

Under normal use with a turbine, you'd never find this leak.  It won't hurt anything but a seal should seal ans this was only 10psi and it's marked 50psi max.